Buggy code:
final class WSEndpointMetrics implements OperationStepHandler { static final WSEndpointMetrics INSTANCE = new WSEndpointMetrics ( ) ; static final AttributeDefinition MIN_PROCESSING_TIME = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "min-processing-time" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition MAX_PROCESSING_TIME = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "max-processing-time" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition AVERAGE_PROCESSING_TIME = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "average-processing-time" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition TOTAL_PROCESSING_TIME = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "total-processing-time" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition REQUEST_COUNT = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "request-count" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition RESPONSE_COUNT = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "response-count" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition FAULT_COUNT = new org . jboss . as . controller . SimpleAttributeDefinitionBuilder ( "fault-count" , org . jboss . dmr . ModelType . INT , true ) . setStorageRuntime ( ) . build ( ) ; static final AttributeDefinition [ ] ATTRIBUTES = new AttributeDefinition [ ] { WSEndpointMetrics . MIN_PROCESSING_TIME , WSEndpointMetrics . MAX_PROCESSING_TIME , WSEndpointMetrics . AVERAGE_PROCESSING_TIME , WSEndpointMetrics . TOTAL_PROCESSING_TIME , WSEndpointMetrics . REQUEST_COUNT , WSEndpointMetrics . RESPONSE_COUNT , WSEndpointMetrics . FAULT_COUNT } ; private WSEndpointMetrics ( ) { } public void execute ( OperationContext context , ModelNode operation ) throws OperationFailedException { if ( context . isNormalServer ( ) ) { context . addStep ( new OperationStepHandler ( ) { public void execute ( OperationContext context , ModelNode operation ) throws OperationFailedException { final ServiceRegistry registry = context . getServiceRegistry ( false ) ; if ( registry != null ) { try { context . getResult ( ) . set ( getEndpointMetricsFragment ( operation , registry ) ) ; } catch ( Exception e ) { <START_BUG> throw new OperationFailedException ( new ModelNode ( ( ( ( WSEndpointMetrics . getFallbackMessage ( ) ) + ":<seq2seq4repair_space>" ) + ( e . getMessage ( ) ) ) ) ) ; <END_BUG> } } else { context . getResult ( ) . set ( WSEndpointMetrics . getFallbackMessage ( ) ) ; } context . stepCompleted ( ) ; } } , RUNTIME ) ; } else { context . getResult ( ) . set ( WSEndpointMetrics . getFallbackMessage ( ) ) ; } context . stepCompleted ( ) ; } @ SuppressWarnings ( "unchecked" ) private ModelNode getEndpointMetricsFragment ( final ModelNode operation , final ServiceRegistry registry ) throws OperationFailedException { } private static String getFallbackMessage ( ) { } private static ServiceContainer currentServiceContainer ( ) { } }

Fix:
throw new OperationFailedException ( ( ( ( WSEndpointMetrics . getFallbackMessage ( ) ) + ":<seq2seq4repair_space>" ) + ( e . getMessage ( ) ) ) ) ;